Fine log added in terminateNode method.

Author: Artmorse

src/main/java/com/google/jenkins/plugins/computeengine/ComputeEngineComputerLauncher.java

@@ -233,7 +233,8 @@ private static void terminateNode(SlaveComputer slaveComputer, TaskListener list
                 listener.error(String.format("Failed to terminate node %s", node.getDisplayName()));
             }
         } else {
-            LOGGER.fine(String.format("Tried to terminate unknown node from computer %s", node.getNodeName()));
+            LOGGER.fine(
+                    String.format("Tried to terminate unknown node from computer %s", slaveComputer.getDisplayName()));
         }
     }